Ilimi- Kintai

Silinda na ciki na injin injin tururi yana da kaurin bango da kunkuntar hanyar tururi a cikin rami na ciki, wanda ke da yuwuwar toshe yashi. An yi nazari akan dalilan da suka haifar da lahani na raguwa a cikin tsarin simintin farko, kuma an kwaikwayi tsarin ƙarfafawa ta amfani da software na MAGMA. An inganta tsarin aiwatar da simintin gyaran kafa ta hanyar da aka yi niyya. Bayan tabbatar da samar da ingantaccen tsarin simintin, simintin simintin yana da kyau kuma ya cika buƙatun fasaha. Idan aka kwatanta da shirin farko, yawan aikin simintin ya karu da kusan kashi 20%.

 

A matsayin daya daga cikin mahimman kayan aiki a cikin masana'antar sarrafa wutar lantarki, ci gaban masana'antar injin tururi ya ta'allaka ne kan yadda za'a inganta yanayin zafi na rukunin injin tururi. Haɓaka ingantaccen yanayin zafi yana da alaƙa da yanayin zafi na babban tururi da sake zafi. Lokacin da yawan zafin jiki na babban tururi da reheat tururi ya karu daga 580 ℃ zuwa 620 ℃, thermal yadda ya dace za a iya ƙara da game da 4% zuwa 6%. A cikin shekaru biyar daga 2013 zuwa 2018, 620 ℃ ultra-supercritical raka'a ci gaba da sauri. Koyaya, tare da ci gaba da haɓaka kariyar muhalli da buƙatun kiyaye makamashi, rukunin wutar lantarki a duniya sun fara bin ingantacciyar fasahar samar da wutar lantarki mai tsabta da ƙarancin hayaki. CB2 abu, wanda yana da kyau kwarai thermal watsin, low thermal fadada coefficient, mai kyau juriya ga intergranular lalata da danniya lalata, a hankali ya maye gurbin gargajiya 12% Cr martensitic zafi-resistant karfe kuma ya zama kayan zabi ga manyan key simintin karfe sassa na biyu-tsara ultra-supercritical turbines [1-2].

 

Koyaya, a halin yanzu, manyan sassa na simintin ƙarfe waɗanda aka yi da kayan CB2, kamar manyan silinda masu ɗaukar nauyi, matsakaicin matsa lamba na ciki da babban tururi mai daidaita bawul ɗin bawul, har yanzu suna da matsaloli kamar rashin daidaiton ingancin sarrafa simintin. Wannan takarda tana nazarin abubuwan da ke haifar da lahani na raguwa a cikin ainihin tsarin simintin silinda na matsakaici-matsi na ciki na CB2, yana ɗaukar hanyar simintin simintin gyaran fuska na tallafin bango da masu tayar da bango don magance matsalolin porosity na shrinkage a dandalin T-dimbin yawa da bututun bututu, yana annabta ingancinsa ta hanyar fasahar kwaikwaiyo ta lambobi, kuma yana tabbatar da shi ta hanyar samar da ainihin samarwa. A ƙarshe, ana samun ƙwararrun samfuran, cimma burin inganta inganci da rage farashi [3-4].

 

1 Halayen Tsari da Bukatun Fasaha na Silinda na Matsakaicin Matsakaicin Ciki

1.1 Tsari Tsari

An nuna ƙayyadaddun tsari na matsakaicin matsa lamba na ciki Silinda a cikin Hoto 1. Matsakaicin ma'auninsa shine 2,420 mm × 1,674 mm × 1,268 mm. Nauyin babban rabi shine kilogiram 8,430, na rabin rabin kuma shine kilogiram 8,570. Matsakaicin kauri na bango shine mm 300, kuma ƙaramin kauri na bango shine mm 85. Akwai makada da yawa na ciki na annular tare da radis daban-daban, yana sa sarrafawa da wahala. Abubuwan buƙatun ingancin gabaɗaya suna da tsauri.

 

1.2 Binciken Material

Kayan silinda mai matsakaicin matsa lamba shine ZG13Cr9Mo2Co1VNbNB-Ⅱ, an rage shi azaman CB2. Ana nuna abubuwan da ake buƙata na sinadaran sinadaran a cikin Table 1. A lokacin da aka gama samfurin samfurin, ana buƙatar ƙazanta da bincike na gas, daga cikinsu akwai Cu ≤ 0.10%, As ≤ 0.025%, Sb ≤ 0.001%, H ≤ 7 × 10-6, O ≤ 9 × 10-5, tare da tsauraran buƙatun.

Ana buƙatar tubalan gwajin kadarorin injina don a jefa su gaba ɗaya tare da babban jiki kuma dole ne a cire haɗin su daga babban jiki yayin aikin maganin zafi. Bayan maganin zafi, ana yanke tubalan gwajin kuma ana sarrafa su cikin samfurori don gwajin kadarorin inji. Ana nuna buƙatun ga masu nuna alama a cikin Tebur 2. Bugu da ƙari, ƙarfin zafi mai zafi a 650 ℃ da 125 N / mm² ana buƙatar ya zama mafi girma fiye da 100 hours.

 

1.3 Gwajin mara lalacewa

100%. MT don duk saman silinda mai matsakaici-matsi na ciki.

 

2. Binciken Kalubalen Fasaha a Silinda Mai Matsakaicin Matsakaicin Ciki

2.1 Binciken Material

Yawan CB2 abu ne 7.8 g/cm³, tare da solidus zafin jiki na 1,482 ℃ da liquidus zafin jiki na 1,510 ℃. Yana da hadaddun sinadarai mai sarƙaƙƙiya tare da abubuwa masu haɗawa da yawa, gami da abubuwa masu gurɓata abubuwa kamar Co, abubuwan da ba su da sauƙi kamar B da N, da kunkuntar kewayon abun da ake buƙata. Duk da ƙarfinsa mai ƙarfi da juriya na thermal, narkakken ƙarfe yana da ƙarancin ruwa da ƙarfi mai ƙarfi mai ƙarfi, yana mai da hankali ga lahani haɗawa. Bugu da ƙari, wurare masu zafi a ƙasan dandalin T-dimbin yawa, matsayi na harshe, flange na tsakiya, da kuma tsaka-tsakin tashoshi na tururi sun warwatse da kuma ware, yana da wuya a cimma nasarar ciyar da kai. Kayan yana ƙunshe da adadi mai yawa na V, wanda ke ƙara haɓakar haɓakawa. Babban nau'in fashewa shine fashewar sanyi, don haka preheating ya zama dole don yankan iskar gas, yanke carbon arc, da walda, tare da zafin jiki na ≥ 300 ℃.

Bukatun maganin zafi don simintin gyare-gyare: daidaita yanayin zafin jiki ≥ 1,040 ℃, da taimako na damuwa na ƙarshe ko zafin jiki na ƙarshe ≥ 730 ℃. Tsarin yanayin zafi na dakin bayan maganin zafi shine lath martensite. Wasu bayanai suna ba da shawarar cewa idan akwai lahani da yawa na simintin gyare-gyare, matakan zafin jiki da yawa da ke haifar da walda na gyare-gyare na gaba zai haifar da raguwa mai yawa a cikin taurin kuma yana da wahala a cika buƙatun fasaha don ƙarfi [5]. Don haka, ƙirar tsarin simintin gyare-gyare mai ma'ana ba wai kawai yana guje wa buƙatun gyaran walda ba amma har ma yana tabbatar da isasshen ƙarfi.

2.2 Tsari Tsari

(1) Matsakaicin matsa lamba na ciki Silinda gabaɗaya shine kusan a cikin siffar "C", tare da bangon flange mai kauri da ƙananan bambance-bambance a cikin kauri na bango a wuraren tashar tururi, yawanci uniform a 85 mm, kamar yadda aka nuna a cikin Hoto 2. Wannan tsarin yana kusan kusan nau'ikan nau'ikan geometric iri ɗaya, tare da babban bambanci a cikin ciyar da gradients. A lokacin solidification, yana da wuya a cimma ciyar da kai da ƙaddamarwa na tsari, yana sa ya zama mai sauƙi ga porosity shrinkage axial.

(2) Bangaren buɗewa na hanyar tururi (ciki har da izinin injina) kusan mm 104 ne kawai. Bayan an zubar da simintin, yashin ginshiƙin mashigar tururi gaba ɗaya yana kewaye da narkakkar karfe, tare da ƙarancin aikin shaye-shaye da kuma sanyaya mai wahala, wanda hakan na iya haifar da yashi mai mannewa ko ma datsewa, wanda hakan ya sa ba za a iya cire yashin ba. A lokaci guda kuma, bayanin martaba na ɓangaren ɓangaren ɓangaren ciki na ɓangaren tururi ya bambanta tare da kusurwar sashin giciye, kuma tsarin tsarin tururi yana da rikitarwa kuma yana rufe. Babban sakawa da ayyukan rungumar ainihin suna da rikitarwa, kuma ginshiƙin yashi ba shi da sauƙi a daidaita shi yayin aiwatar da raguwar ainihin, wanda ke da yuwuwar haifar da ɓarna. Hakanan yana da matukar wahala a duba girman kogon.

 

3. Zane na Tsarin Simintin Ɗaukaka da Kwaikwayo Lambobi don Silinda Mai Matsakaicin Matsakaicin Ciki

CB2 abu ne na musamman tare da babban fa'ida hankali. Don guje wa gyare-gyaren walda mai girma da hana haɓakar fasa da yaduwa, da kuma la'akari da ƙayyadaddun buƙatun don inganci da inganci na ciki, tsarin gating ya kamata a sanya shi a saman mashin ɗin yayin zayyana tsarin simintin. Cire tushen riser ta hanyar yin aiki yana da amfani don hana samuwar tsagewa. Bugu da ƙari, ya kamata a yi amfani da hanyoyin simintin ƙididdigewa don tabbatar da ingancin aikin simintin gyaran kafa da rage lahani, ta yadda za a guje wa matsalolin tsagewa sakamakon cire lahani da gyaran walda.

3.1 Zane na Tsarin Tsarin Simintin Ɗaukaka

Matsayin farfajiyar rabuwa a cikin ƙirar tsarin simintin yana ƙayyade daidaiton girma da ingancin gyare-gyaren simintin [6-7]. Wurin flange na matsakaicin matsa lamba na ciki Silinda shine matsayi tare da matsakaicin kauri na bango da kuma machining surface. Yin amfani da shi azaman farfajiyar rabuwa, an tsara tsarin aikin simintin tare da ɓangaren simintin yana fuskantar ƙasa. Wannan ba kawai sauƙaƙe ciyar da lokacin kauri da manyan wuraren zafi ba amma kuma yana sauƙaƙe yanke masu tashi. A lokaci guda, duk simintin gyare-gyare yana samuwa a cikin ƙananan akwati, wanda ya dace don gyare-gyare da kuma rufe akwatin.

An gina samfurin ta amfani da software na UG kuma an shigo da shi cikin software na kwaikwayo na MAGMA. Yawan rabe-raben raga ya kai miliyan 20. An gudanar da simintin gyare-gyare kai tsaye a kan simintin gyare-gyare ba tare da masu tasowa ba, kuma an nuna sakamakon simintin ƙuƙumman cavities a cikin Hoto 3. Matsayin raguwar raguwa sun fi mayar da hankali a wurin zama na bawul, harshe, da dandalin T-dimbin yawa, da dai sauransu.

 

Dangane da wurin da kogon raguwa yake, an tsara tsarin aiwatar da aikin simintin kamar haka: (1) Ana ɗaukar hanyar zagaye, kuma an ƙera mai hawan da ke bin siffar a ɓangaren sama na flange. Ana amfani da tasirin dual na matsin yanayi da nauyin kai na mai tashi don haɓaka ƙarfin ciyarwar ruwa na ƙarfe na simintin. Bugu da ƙari, ana ƙara abinci da ɗan adam ya yi a ƙasan mai tashi don ciyar da flange da babban jikin simintin. (2) Ana ƙara ciyarwar tsiri mai tsayi zuwa saman farfajiyar tururi don ciyar da ƙananan ɓangaren tururi. (3) Ana amfani da makaho mai tashi sama da buɗaɗɗen tururi don ciyar da sashin harshe. (4) Ana amfani da mai tashi makaho a cikin hanyar tururi don ciyar da dandalin dandalin T mai siffa, kuma an saita ƙarfe mai sanyi na waje mai kauri mai ma'ana a waje. (5) Ana amfani da ƙayyadaddun ƙayyadaddun ƙarfe daban-daban na ƙarfe na sanyi na waje don rarrabawa, kuma a haɗa su tare da makafi da buɗaɗɗen tashi don ciyarwa.

 

Dangane da hanyoyin gyare-gyare, ana ɗaukar hanyar gyare-gyaren "babban mold + core rataye". Babban kogon gyare-gyare baya buƙatar yin wasu kwalaye masu mahimmanci, kuma babu wani daftarin kusurwa da ke buƙatar saitawa. Don tsarin ɗaiɗaikun ɗaiɗai waɗanda ke shafar ɗaga ƙura, ana amfani da haɗin kumfa da kayan raye-raye don cimma haɗaɗɗun simintin gyare-gyare na babban yashi na ciki da haɓaka daidaiton girman yashi. Ana nuna tsarin aiwatar da simintin gyare-gyare na ƙarshe a hoto na 4.

 

3.2 Simintin Lamba na Tsarin Cast

Tsarin wannan simintin yana da rikitarwa. Anyi amfani da software na MAGMA don kwaikwayi filin zafin jiki da raguwar ramukan yayin aikin ƙarfafa tsarin simintin don tabbatar da yuwuwar ƙirar tsarin simintin, rage haɗarin lahani a cikin ainihin tsarin samarwa, da samar da ingantaccen tallafin bayanai don haɓaka tsari. Abubuwan da ke cikin ƙirar tsarin simintin gyare-gyare an canza su zuwa fayilolin STL kuma an shigo da su cikin software na MAGMA a jere don haɗakarwa, tare da adadin raga na miliyan 20. Ana nuna sakamakon simintin a cikin hoto na 5. Ana iya ganin cewa babu lahani na raguwa a cikin simintin gyaran kafa, kuma an auna tsayin amintaccen mai hawan ya zama 80 mm.

 

Sakamakon kwaikwaiyo na shrinkage porosity yana nuna cewa akwai babban yanki na toshewar haɓaka porosity na toshe sama da bututun bututu da kuma a matsayin dandamali na T-dimbin yawa. Dangane da buƙatun gwajin da ba a lalata ba, buƙatun ingancin buƙatun flange da yankin nassi na tururi suna da tsauri, kuma an yarda da su a matakin 1. Irin wannan sakamakon kwaikwaiyo na porosity shrinkage zai shafi ingancin samfurin. Yin nazarin dalilan, duk da cewa an ƙara tallafin ɗan adam a kasan silinda, saboda kauri mai siffar T, kaurin bangon yana da girma, kuma wuri mai zafi a nan ba a kawar da shi gaba daya ba. A daya bangaren kuma, saboda tsarin silinda da kansa, makaho ba za a iya saita shi kai tsaye sama da bututun bututun ba, kuma don guje wa tasirin zafi da makaho zai tashi a yankin flange, sai a nisantar da makahon daga bude bututun Silinda, wanda ke kara nisa don ciyarwa kuma yana rage tasirin ciyarwar makaho sosai.

 

3.3 Haɓaka Tsarin Tsarin Casting

Tsarin da aka inganta yana ɗaukar tallafin bango da tsarin hawan bango. Kamar yadda aka nuna a cikin hoto na 6, an saita "tallafin bango" kusa da bangon rami na ciki a bandejin zobe na Silinda, tare da saita tashi sama da shi don maida hankali wurin zafi. Mai tashi mai buɗewa yana ciyar da ɓangaren gaba ɗaya ta hanyar tallafin bango, kuma wannan tallafin "D-dimbin yawa" yana aiki azaman haƙarƙari na ciki, yana hana nakasa. Ana ƙara tallafin da ɗan adam ya yi a bangarorin biyu na bangon waje na silinda na ciki don samar da tashar ciyarwa don dandalin T mai siffa. Idan aka kwatanta da tsarin farko, nisan tashar ciyarwa ya fi guntu kuma tasirin ya fi bayyane. Ana ƙara tallafi tsakanin flange da buɗaɗɗen bututu don samar da tashar ciyarwa. Domin kaurin bangon kauri na mashigar tururi na ciki na Silinda inda aka sami bambance-bambancen gradient na ciyarwa, an ƙirƙiri tallafin daidaitaccen abin da ɗan adam ya yi ta amfani da hanyar da'irar birgima. An saita ƙarfe mai sanyi a waje na hanyar tururi. Haɗin amfani da tallafi, masu tashi, da baƙin ƙarfe mai sanyi suna samar da tashoshi daban-daban na ciyarwa don ciyar da wuraren zafi masu tarwatsewa da masu zaman kansu na Silinda, yadda ya kamata don guje wa lahani na dandamali mai siffar T da bututun buɗewa a cikin tsarin farko. Bugu da ƙari, an saita haƙarƙari a wurin canjin fillet tsakanin waje na hanyar tururi da babban jikin simintin don sarrafa samuwar tsaga.

 

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Ana nuna sakamakon kwaikwayo na ingantaccen tsarin tsari a cikin Hoto na 7. Duk cavities na raguwa suna wanzu a cikin sanyi irin na bango da masu tashi, kuma suna da nisa daga matsayi na ƙungiyar zobe. Babu lahani na raguwa a cikin simintin gyaran kafa. Sakamakon filin zafin jiki yana nuna cewa gabaɗayan yanayin ƙarfafa ƙarfi yana kan layi, kuma amfani da sanyin waje ya yi tasiri. Daga sakamakon kwaikwaiyo na raguwar porosity, babu manyan toshewar porosities kamar a cikin shirin aiwatar da simintin farko. Yawancin su ba su da ma'ana-kamar shrinkage porosities, waɗanda za a iya watsi da su a ainihin samarwa.

 

4 Maɓallin Maɓalli na Maɓalli a cikin Tsarin Samar da Matsakaicin Matsakaicin Ciki Silinda

4.1 Halayen Karfe

Tsarin ƙarfe shine "lantarki tanderu m refining + LF refining + VD injin tacewa". Ana sarrafa tsarin sinadaran kamar yadda yake a cikin Table 1. Abubuwa irin su V, Nb, da Cr a cikin narkakkar karfe na iya samar da nitrides barga tare da N. Duk da haka, dangantakar su ga oxygen ya fi girma fiye da haka don N. Bugu da ƙari, B yana da dangantaka mai karfi ga O. Saboda haka, don ƙara yawan solubility na N a cikin narkakkar karfe da sarrafa abun ciki na B, tsananin deoxidation wajibi ne. Saboda tsananin kulawa da abun ciki na Al, ana amfani da Al azaman deoxidizer na ƙarshe a cikin adadin da ya dace, wanda zai iya sarrafa O yayin haɓaka yawan amfanin ƙasa. Narkakken karfen yana auna kilogiram 23,500, kuma zafin zafin jiki shine 1,580 zuwa 1,590 ℃.

4.2 Halayen Molding

Dukkanin saman matsakaicin matsa lamba na ciki Silinda suna buƙatar yin gwajin UT da MT, musamman ma ƙayyadaddun ƙa'idodin ingancin gwaji marasa lalacewa don yankin fasinjan tururi suna da tsauri. Da zarar hanyar tururi ya kasance mai tsanani tare da yashi, zai yi tasiri mai mahimmanci akan ingancin yayin aikin cire yashi. Don guje wa matsalar mannewar yashi a cikin hanyar tururi, an rataye tsakiyar rami na ciki ta hanyar amfani da hanyar CO2 hardening hade da Verkote sabon yashi chromite. Babban kashin da ke cikin mashigin tururi ana yin shi ne ta hanyar walda bututun ƙarfe maras tushe tare, tare da ramukan da aka haƙa kewaye da bututun ƙarfe da ramukan igiyoyin nailan da aka raunata a waje, wanda ke daɗa fitar da iskar gas. Lokacin hardening na yashi core ana sarrafa ta lokacin CO2 gas allura. Gaba ɗaya ƙashi na tsakiya yana taimakawa wajen gyara ginshiƙin yashi kuma ya hana shi daga iyo. Ana tabbatar da daidaiton ainihin sakawa ta hanyar haɗa ainihin kai tare da samfurin binciken rami.

Tun da rufin da aka yi amfani da shi a cikin wannan ma'aikata shi ne barasa na tushen zirconium silicate foda shafi, don kauce wa samuwar pores surface, da rami da kuma core daga shafi ana amfani da akalla sau hudu. Bayan kowace aikace-aikacen, yana buƙatar a kunna shi kuma a bushe sosai kafin a niƙa shi da laushi don Layer na gaba.

 

4.3 Tsarin Zubawa da Tsaftacewa

Ana ɗaukar zubar da jaka guda ɗaya, kuma an tsara tsarin zubar da ruwa mai Layer uku, tare da ƙofofin ciki biyu a kowane Layer. Layer na ƙasa shine nau'in dawowar ƙasa, yayin da sauran yadudduka biyu nau'ikan shigarwa ne na gefe. Tsarin zubewar nau'in dawowa na ƙasa yana sauƙaƙe sauƙi da jinkirin kwarara da haɓakar narkakken ƙarfe ba tare da haifar da tasiri mai ƙarfi ba. Saboda ƙaramin kauri na bango a ƙananan sassa na mold, ruwan saman yana tashi da sauri zuwa tsayin tsarin shigar da gefen Layer na biyu, wanda zai iya rage faruwar fantsama da kama gas [8].

 

Don hana hadawan abu da iskar shaka a lokacin aikin zubar da ruwa, an cika rami na mold da iskar argon minti 30 kafin a zuba. Ana auna ma'aunin iskar oxygen a cikin rami mai kyalli tare da na'urar gano iskar oxygen mai ɗaukar nauyi don zama ƙasa da 5%, kuma ana kiyaye kariya ta iskar argon a duk lokacin aikin ta hanyar amfani da zoben kariya na argon gas da busa bututun argon.

 

Dangane da zafin jiki na ruwa na 1,510 ℃ don kayan CB2 da ƙwarewar samarwa masu dacewa, an saita yawan zafin jiki a 1,545 zuwa 1,560 ℃. Saboda kasancewar V a cikin kayan, wanda ke da saurin fashewa, dole ne a sarrafa lokacin riƙewa sosai don guje wa fashewar da aka samu ta hanyar cire akwatin da ba a kai ba. Bayan an kafa ramin, sai a yi preheated mai tashi bisa ga tsarin yankan da aka keɓe, sannan a yanke mai tashi da mai zazzaɓi a cire sprue. Yayin duk aikin yanke, zafin simintin kada ya faɗi ƙasa da 300 ℃.

 

5 Tabbatar da Samfura

Bayan tsarin adana zafi da wasan dambe, ba a sami yashi mai ɗorewa ba a cikin ramin motsi na silinda mai matsakaicin matsa lamba a lokacin aikin tsaftacewa. Ba a sami raguwar porosity, fasa ko wasu lahani na simintin gyare-gyaren da gwajin UT ya gano ba bayan m da gama aikin injin. Binciken girma kuma ya cika buƙatun zane. Bayan maganin zafi, aikin dubawa ya cancanta, kuma an nuna sakamakon gwajin a cikin Table 3. Wannan samfurin ya cika ka'idodin fasaha, yana nuna cewa ingantaccen tsarin simintin gyare-gyare, kamar ƙirar bangon bango da ba da izinin ciyarwa, sanyawa na baƙin ƙarfe mai sanyi, da yashi mai hana ruwa da matakan shayewa, duk suna da tasiri. Ana nuna simintin gyare-gyare a cikin hoto 8.

 

Shafin 4 yana nuna kwatancen tsakanin ingantattun tsare-tsare da na farko. Aiwatar da tallafin bango da masu hawan bango ba wai kawai yana guje wa faruwar lahani na simintin gyaran kafa ba amma kuma yana rage nauyin zub da jini da kilogiram 5,000. Yawan aikin simintin gyaran gyare-gyare yana ƙaruwa da kusan kashi 20%, kuma an inganta rabon ma'aunin nauyi zuwa zuba nauyi da kusan 10%, don haka rage farashin samarwa.

Kammalallen 6

(1) The kwaikwaiyo sakamakon biyu matakai, wato conformal riser da bango riser, nuna cewa yin amfani da bango tallafin da bango risers iya mafi yadda ya kamata magance da simintin aiwatar al'amurran da suka shafi na matsakaici-matsa lamba ciki Silinda, kamar watsawa da zafi spots da kuma low yadda ya dace na makãho riser ciyar, da muhimmanci rage abin da ya faru na shrinkage da ingancin samfurin, da kuma shrinkage. matsakaici-matsi na ciki Silinda.

(2) Ingantawa da haɓaka aikin simintin silinda mai matsakaita-matsi na ciki sun ƙara yawan yawan simintin simintin da kusan 20%, yana rage farashin samarwa sosai.

 

Vigor tana da ƙwarewa sama da shekaru 20 da kuma ƙwararrun ma'aikata a fannin yin siminti, yin ƙera ƙarfe da kuma gyaran bayan an yi amfani da shi. Idan kuna da wata tambaya ko samfura da kuke buƙatar yi, da fatan za ku iya tuntuɓar mu a info@castings-forging.com